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West Baton Rouge Natural Gas & Water Systems

Sewage treatment plant, Erwinville, Louisiana. NPDES permit LA0122131, in force until Jun 14, 2028. Last 12 months: over a limit 20 times (last June 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A quarterly (32 values), form Q quarterly (6 values)
Renewal application due
Dec 17, 2027 · 180 days before expiry; your permit may set another date
Last report on file
June 2026
Oct 2024 – Sep 2025
25 values over a limit, 0 required values missing, 8 of 16 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

All 20 values over a limit
Period endingParameterReportedLimitOver by
October 2025Coliform, fecal general, weekly geometric mean1730 MPN/100mL≤ 400 #/100mL333%
October 2025Solids, total suspended, monthly average22.75 lb/d≤ 16 lb/d42%
October 2025Solids, total suspended, monthly average30 mg/L≤ 15 mg/L100%
October 2025Solids, total suspended, weekly average34 mg/L≤ 23 mg/L48%
November 2025Solids, total suspended, monthly average18 mg/L≤ 15 mg/L20%
November 2025Solids, total suspended, weekly average30 mg/L≤ 23 mg/L30%
November 2025pH, instantaneous minimum1.55 SU≥ 6 SU—
December 2025BOD, 5-day, 20 deg. C, monthly average10.12 lb/d≤ 10 lb/d1%
December 2025BOD, 5-day, 20 deg. C, monthly average13 mg/L≤ 10 mg/L30%
December 2025BOD, 5-day, 20 deg. C, weekly average20 mg/L≤ 15 mg/L33%
December 2025Solids, total suspended, monthly average19 lb/d≤ 16 lb/d19%
December 2025Solids, total suspended, monthly average24 mg/L≤ 15 mg/L60%
December 2025Solids, total suspended, weekly average28 mg/L≤ 23 mg/L22%
January 2026BOD, 5-day, 20 deg. C, monthly average12 mg/L≤ 10 mg/L20%
January 2026Solids, total suspended, monthly average18 mg/L≤ 15 mg/L20%
February 2026Solids, total suspended, weekly average24 mg/L≤ 23 mg/L4%
March 2026Coliform, fecal general, monthly geometric mean< 400 MPN/100mL≤ 200 #/100mL100%
April 2026Coliform, fecal general, monthly geometric mean< 400 MPN/100mL≤ 200 #/100mL100%
May 2026Coliform, fecal general, monthly geometric mean< 400 MPN/100mL≤ 200 #/100mL100%
June 2026Chlorine, total residual, instantaneous maximum1.59 mg/L≤ .033 mg/L4718%

Limits in force (38)

ParameterStatisticLimitMonths
BOD, 5-day, 20 deg. Cmonthly average≤ 10 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 10 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 15 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 15 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 10 lb/dall year
BOD, 5-day, 20 deg. Cmonthly average≤ 10 lb/dall year
pHinstantaneous minimum≥ 6 SUall year
pHinstantaneous minimum≥ 6 SUall year
pHinstantaneous maximum≤ 9 SUall year
pHinstantaneous maximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 15 mg/Lall year
Solids, total suspendedmonthly average≤ 15 mg/Lall year
Solids, total suspendedweekly average≤ 23 mg/Lall year
Solids, total suspendedweekly average≤ 23 mg/Lall year
Solids, total suspendedmonthly average≤ 16 lb/dall year
Solids, total suspendedmonthly average≤ 16 lb/dall year
Nitrogen, total [as N]monthly averagereport only (mg/L)all year
Nitrogen, total [as N]daily maximumreport only (mg/L)all year
Nitrogen, total [as N]monthly averagereport only (lb/d)all year
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]weekly averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]weekly averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]monthly averagereport only (lb/d)all year
Nitrogen, ammonia total [as N]monthly averagereport only (lb/d)all year
Phosphorus, total [as P]monthly averagereport only (mg/L)all year
Phosphorus, total [as P]daily maximumreport only (mg/L)all year
Phosphorus, total [as P]monthly averagereport only (lb/d)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (gal/d)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (gal/d)all year
Flow, in conduit or thru treatment plantweekly averagereport only (gal/d)all year
Flow, in conduit or thru treatment plantweekly averagereport only (gal/d)all year
Chlorine, total residualinstantaneous maximum≤ .033 mg/Lall year
Chlorine, total residualinstantaneous maximum≤ .033 mg/Lall year
Coliform, fecal generalmonthly geometric mean≤ 200 #/100mLall year
Coliform, fecal generalmonthly geometric mean≤ 200 #/100mLall year
Coliform, fecal generalweekly geometric mean≤ 400 #/100mLall year
Coliform, fecal generalweekly geometric mean≤ 400 #/100mLall year

New limits from Jun 15, 2028

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Nitrogen, ammonia total [as N], monthly average1.2 mg/Lnew——
Nitrogen, ammonia total [as N], monthly average1.3 lb/dnew——
Nitrogen, ammonia total [as N], weekly average2.9 mg/Lnew——

How strict are these limits?

Cited limits by parameter: Louisiana's rules and the federal ones.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/LA0122131 · MCP: https://passage-data.com/mcp